<template>
  <div class="cart">
    <h4>全部商品</h4>
    
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(item) in shoppingTrolleyList" :key="item.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" 
              :checked="item.isChecked == 1"
              @change="updateChecked(item.skuId,$event)"
            >
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl">
            <div class="item-msg">{{item.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{item.cartPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a @click="handler('minus',-1,item)" class="mins hoverLi">-</a>
            <input autocomplete="off" type="text" :value="item.skuNum" minnum="1" class="itxt" 
              @change="handler('change',$event.target.value * 1,item)">
            <a @click="handler('add',1,item)" class="plus hoverLi">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{item.skuNum * item.cartPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet hoverLi" @click="DelCart(item.skuId)">删除</a>
            <br>
            <a href="#none" class="hoverLi">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" @change="CheckAll" :checked='isAllCheck && shoppingTrolleyList.length > 0'>
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="DelPitchOn" class="hoverLi">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{CountNumberCart}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{CountMoney}}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="CliSettlement">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex'
import throttle from "lodash/throttle";
  export default {
    name: 'ShopCart',
    mounted() {
      this.getData()
    },
    methods: {
      //单击结算
      CliSettlement(){
        this.$router.push('/trade')
      },
      //删除选中的商品
      async DelPitchOn(){
        try {
          await this.$store.dispatch('DelPitchOnChecked')
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      },
      //修改单个选中状态
      async updateChecked(skuId,event){
        try {
          let isChecked=event.target.checked ? '1' : '0'
          await this.$store.dispatch('getCheck',{
            skuId,
            isChecked
          })
          this.getData()
        } catch (error) {
          alert(error.message)
        }
        
      },
      //全选
      async CheckAll(event){
        let result = event.target.checked ? '1' : '0'
        try {
          await this.$store.dispatch('updateAllChecked',result )
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      },
      //删除购物车中的商品
      async DelCart(id){
        try {
          await this.$store.dispatch('getDelCart',id)
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      },
      getData(){
        this.$store.dispatch('getCartDataList')
      },
      //修改一个产品的个数   因为点击过快  会出现负数
      handler:throttle(async function (type,disNum,cart) {
          //type:为了区分这三个元素
          //disNum形参:+ 变化量（1）  -变化量（-1）   input最终的个数（并不是变化量）
          //cart:哪一个产品【身上有id】
          switch (type) {
            //添加
            case "add":
              disNum = 1
              break;
            //减小
            case "minus":
              disNum = cart.skuNum > 1 ? -1 : 0
              break;
            //输入框
            case "change":
              if(isNaN(disNum) || disNum < 1){
                disNum = 0
              }else{
                disNum = parseInt(skuNum) - cart.skuNum
              }
              break;
          }
          try {
            await this.$store.dispatch('getaddOrUpdateShopCart',{
              skuId:cart.skuId,
              skuNum:disNum
            })
            this.getData()
          } catch (error) {
            
          }
      },600)
    },
    computed: {
      ...mapGetters(['shoppingTrolley']),
      shoppingTrolleyList(){
        return this.shoppingTrolley.cartInfoList || []
      },
      //计算总价
      CountMoney(){
        let sum = 0
        this.shoppingTrolleyList.forEach(item => {
          sum += item.skuPrice * item.skuNum
        }); 
        return sum
      },
      //计算件数
      CountNumberCart(){
         let boolCount = 0
         this.shoppingTrolleyList.forEach(item => {
          if(item.isChecked){
            boolCount++
          }
        }) 
        return boolCount || 0
      },
      //判断底部复选框是否勾选【全部产品都选中，采勾选】
      isAllCheck() {
        //遍历数组里面原理，只要全部元素isChecked属性都为1===>真 true
        //只要有一个不是1======>假false
        return this.shoppingTrolleyList.every((item) => item.isChecked == 1);
      },
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }


          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
  .hoverLi:hover{
    cursor:pointer;
  }
</style>